Good genes or a good doc?

Whatever the reason, we just can't believe Heather Graham (aka Rollergirl) is 41-freakin'-years-old!

The actress, who's been working steadily since the late 80's, flashed us a smile as she left a lunch in Beverly Hills on Friday.

Even though Graham played a stripper who married Ed Helms' character Stu in a Vegas wedding in The Hangover, unfortunately, she won't be returning for The Hangover II, which features Stu's bachelor party in Bangkok.